Envelop.



N0. 821,48 1] 'PATENTED MAY 22, 1906. J. H GREGG & A. J. WILLIAMS.

ENVELOP.

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glvwentow UNITED STATES PATENT oEEIoE.

JOHN H. GREGG AND AMOS J. WILLIAMS, OF WARSAW, PENNSYLVANIA.

ENVELOP- Specification of Letters Patent.

ratenteu May 22, 1906.

Application filed July 8, 1905. Serial No. 268,782.

, velop. It has for its object to produce an envelop which after it has once been sealed cannot be opened without detection.

For a full description of the invention and the merits thereof and also to acquire a knowledge of the details of construction of the means for effecting the result reference is to be had to the following description and accompanying drawings, in which Figure 1 is a perspective view of the envelop, showing the flaps in an open position. Fig. 2 is a longitudinal sectional view taken through the envelop when folded. Fig. 3 is a transverse sectional view showing the en- 'velop when folded.

Corresponding and like parts are referred to in the followin description and indicated in all the views 0 the drawings by the same reference characters.

. The numeral 1 designates the front of the envelop, 2 the back, which is of the same size and shape as the front and is provided with a longitudinal slot 3, and 4 the end flaps, which are of such a length as to leave a space between their ends when folded in normal position. The sealing-flap 5 is provided with a tab 6. An intermediate slip 7 of a slightly smaller size than the envelop and havlng a slot 8, corresponding to the slot 3, is employed in conjunction with the before-described device.

In use the intermediate slip 7 is placed upon the front of the envelop, the flaps 4 folded back thereon, and the back 2 folded down upon the flaps. The sealing-flap 5 is then folded over in the usual manner and the tab 6 thrust through the corresponding openings '3 and 8 in the back of the envelop and the intermediate slip secured on the inside of the envelop by some adhesive substance. In practice the tab is preferably folded back upon the sealing-flap 5, so as to pass upward after going through the openings 3 and 8. The

slip 7, the end faps 4, the back of the envelop 2, and the sealing-flap 5 are all intended to be fastened together by some adhesive substance. It will thus be understood that owing to the peculiar construction of the various parts and the position of the tab 6 it will be impossible for the envelop to be opened without detection after it has been a sealed.

Having thus described the invention, what is claimed as new is The combination of an envelop comprising end flaps, a sealin -tab, and a back, the latter being providec with an opening, and an independent intermediate slip having an opening therein corresponding to the opening in the back of the envelop, said intermediate slip being so placed as to confine the end flaps between itself and the back of the envelop, while the sealing-tab passes through the corresponding openings in the back of the envelop and the intermediate slip and has its end secured to the back of the latter.

In testimony whereof we afliX our signatures in presence of two witnesses.

J. H. LINDEMUTH. 

